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DOS APPEND

For a long time, I couldn’t quite grasp what the DOS APPEND command could possibly be good for. Until I came across a situation which APPEND was made for.

With APPEND in place, the old MASM 1.25 which uses FCB I/O will find the centrally located include files, and the source code can be organized into a neat hierarchical structure that’s far easier to work with than one giant blob. APPEND is a “DOS extension”, in fact it is a TSR which intercepts INT 21h and adds special handling for several subfunctions. The original PC Network Program version of APPEND was written by someone with initials G. G. A., and in 1986 it was adapted for shipping with DOS by B.

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